Lathe-driver.



PATENTED MAR. 10, 1908.

J BURT LATHE DRIVER.

'APPLIOATION FILED APR.4.1907

2 SHEETS-SHEET 1.

- I/VVENTOH ,4 TTOR/VEYQS rd: NORRIS PETERS 110,881,373; I PATENTEDMARL10,1908.'

LBURT.

' LATHE DRIVER.

APPLICATION FILED APR-4,1907.

2 SHEETS-SHEET 2.

WITNESSES:

INVENTOR m: mamas PETERS c0 of the United States, residin UNITED STATES -1?ATENT oFFio.

JOHN BURT, OF NARBERTH,"PENNSYLVANIA, ASSIGNOR TO WILLIAM SELLERS & COM- PANY, INCORPORATED, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

LATHE-DRIVER.

Specification of Letters Patent.

Patented March 10, 1908.

To all whom it may concern:

Be it known that 1, JOHN BURT, a citizen at Narberth, county of Montgomery, and tate of Pennsylvania, haveinvented anew and useful Improvement in Lathe-Drivers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

The main object of my invention is to provide a means by which a wheel or a pair of wheels mounted on an axle centered between the centers of a wheel lathe, can be efiectively secured to the face plate or face plates, and made to rotate against the resistance of a heavy cut applied to the rim of the wheel in such a manner that the gripping tendency of the driver upon the wheel adjusts itself automatically to the resistance of the out.

It is a further object of my invention to avoid any special eflort or hard labor on the part of the operator in the application of the driver to the wheel, such as would be required to handle and use heavy wrenches or sledge hammers.

It is a further object of my invention to provide a fixed open position of the driver, so that work can be placed and removed with arts nec-f ease, and also to combine all the essary for its functions in one unit with no loose pieces to handle, and to thus avoid the risk of losing or mislaying such pieces and consequent loss of time.

A driver attaining the objects hereinbefore mentioned has been heretofore invented by Lars H. Vold and forms the subject matter of an application heretofore'filed by him.

Another special object of my invention is devise a driver, embodying the essential features of the Vold driver, but adapted and arranged for application to the outside only of a piece of work such as a pair of wheels,

with solid webs, mounted on an axle centered between the centers of a wheel lathe, thereby enabling the hereinbefore stated objects to be attained when the nature of the work is such as to preclude the work being gripped between gripping or clam ing parts carried on the same face plate, a though it will be understood that the invention is capable of use even with work to which the Vold driver is applicable.

In the drawings: Figure 1 is an elevation of the driver attached to a face plate of a lathe.

is a side elevation of the main parts of the lathe showing the application of the driver and the struts for preventing distortion of the work.

1 is the face plate of the lathe. To the face-plate is bolted the stand 4 having projections 40, to which an arm or lever 3 is pivoted between its ends by means of a bolt 2 passing through the lever and secured to the projections 40 by means of the nut 41. One end of the lever is provided with a semicircular bearing face in which is seated a block 6 provided with a dove-tail projection 60 eX- tending within a dovetail recess 61 formed in the semicircular bearing face. The block 6 is also provided with a saw-toothed gripping face 7 arranged to come up against the work 8 and drive the same against the resistance of the cut, the semi-circular seat enabling the block to adjust itself to seat itself properly against the face of the work. The opposite end of the lever 3 is provided with flanges 30 forminga recess into which extends an eccentric 5 pivoted to the flanges 30 by means of a bolt 10. One flange 30 is of sufiiciently greater diameter than the bolt to receive a bushing 100 between whose flange 101 and the nut 102 is confined the coil spring 103. The bushing, eccentric, and bolt are keyed together by means of the key 104. The part of the bolt passing through the other flange 30of the lever 3 is somewhat enlarged so as to be shouldered against the cocentric 5. The described construction is such that the spring tends to hold the eccentrio in the position to which it has been moved, while permitting it to turn on the bolt 10 as hereinafter described.

The eccentric 5 is provided with a sawtoothed clamping face 11, curved on an are described about the point 12 and adapted to bear against the work 8. The center 12 is so tooth face in contact with the said plane, the axis of the bolt 10 will be moved outwardly away from the work, carrying the corresponding end of lever 3 with it, and moving the lever 3, and the lathe rotated and a cut ting tool applied to the work, resistance of the work to rotation sufficient to cause a slipping of the saw toothed face 7 will cause the work to move in the direction of the arrow y relatively to the driver. This motion will cause the eccentric-5, biting with its saw toothed face 11 in the face of the work 8, to swing in the direction of the arrow as around its pivot 10, thus causing a corresponding movement of block 6 around pivot 2 against the work. As both the work 8 and stand 4 are solidly backed up and unyielding, the saw-toothed face 7 of the block 6 will be driven into the work 8 and continue to be so until the relative motion between stand 4 and work 8 stops; that is, until the gripping of the saw-toothed face 7 of block 6 has overcome the cutting pressure and slippage of the work ceases. It is evident that such an arrangement of drive will set up a heavy pressure between the work and the face-plate, and means to resist same must be adopted.

In Fig. 6 is shown a car-wheel lathe for which this method of chucking is especially adapted. The work 8 is shown as a pair of car wheels on their axle 17 centered between the centers 13 of the lathe and a pluralty of drivers is attached to each face plate. 14 are spindles carrying the centers 13 and adapted to slide in the heads 15 respectively but not to move with same when the heads are adjusted to and from the work on bed 16. The spindles are adjusted by means, not shown, attached directly to the bed 16. The wheels 8, on their axle 7, can be centered between the centers 13 and held centrally while the heads 15 are moved up until the drivers touch the wheel rims. The heads 15 are adjusted on the bed by a right and left hand screw 19, supported on the bed 16 by stand 18, and having the collars 190 limiting its endwise movement to a working clearance each side of the ideal central position. 21 is a gear on the end of the screw shaft by means of which the screw is driven.

As the drivers, as previously described, tend to create pressure between the work and the face-plate, and as there are a pair of wheels and a pair of face-plates facing each other, there will necessarily be a pressure across between the car wheels tending to spring, distort, or dish the wheels. To neutralize this crushing tendency, struts 20 are placed directly opposite the drivers and extended between the wheels and. provided with set-screws 200 adjustable against the wheel rims.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. A driver for work centered between the centers of a lathe and adapted for application to one face only of the work, comprising two parts adapted to engage the same face of the work, one part being movable in a direc tion substantially parallel to the axis of the lathe and the other )art being relatively movable in substantially the direction of rotation of the lathe, and connections between the parts adapted, by the stated action of the second part, to be actuated to produce the stated movement of the first part, thereby increasing the gripping force applied to the work proportionate y to its reslstance to 1'0- tation.

2. A driver for work centered between the centers of a lathe, comprising a support ada ted to be attached to the face plate of the lathe, a part having a gripping face arranged to abut against one face of the work, a clamping part adapt-ed to engage the same face of the work and partake of its movement, a lever carrying the gripping part and pivotally connected to the su )port and to the clam ing part and adapted, by the action of the c ampmg part, to be swung on its pivot to embed the gripping face into the work.

3. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face plate of a lathe, a lever pivoted thereto on an axis substantially perpendicular to the axis of rotation, a gripping part on said lever adapted to engage the face of the work, and a clamping part, adapted to engage the face of the work, pivoted to the lever on an axis substantially parallel to the axis on which the lever is pivoted.

4. A'driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face plate of a lathe, a lever pivoted thereto on an axis substantially perpendicular to the axis of rotation, agripping part at one end thereof ada ted to engage the face of the work, an a clamping part, adapted to engage the face of the work, pivoted at the other end of the lever on an axis substantially parallel to the axis on which the lever is pivoted.

5. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face plate of a lathe, a gripping part, a lever carrying the gripping part and pivoted on the support and adapted, while turning on its pivot, to move the ri ping part in a direction substantially partille to the axis of the lathe, and an eccentric, having a toothed face, attached to the lever and adapted, in its actuation by the Work in the latter s resistance to rotation, to operate the lever and cause its gripping part to embed itself in the work.

6. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face-plate of a lathe, a lever pivoted on the support, a gripping part carried on one end of the lever, and an eccentric, having a toothed face, attached to the other end of the lever.

7. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face plate of a lathe, a lever pivoted to the support on an axissubstantially perpendicular to the axis of rotation, a gripping part carried on one end of said lever, and an eccentric, having a toothed face, pivoted to the other end of the lever on an axis substantially parallel to the axis on which the lever is pivoted.

8. A driver for work centered between the centers of a lathe, comprising a support adapted for attachement to the face-plate of a lathe, a lever pivoted to the support having a concave bearing face, a gripping part having a convex face turnable within said bearing face, and means movably attached to the lever and adapted to engage and be actuated by the work in the latters resistance to rotation and actuate the lever.

9. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face-plateof a lathe, a lever pivoted to the support having a concave bearing face, a gripping part having a convex face turnable within said bearing face, a projection on the convex face of the gripping part engaging a groove in the bearing face of the lever and permitting said turning movement while restraining it from lateral movement, and means movably attached to the lever and adapted to engage and be actuated by the work in the latters resistance to rotation and actuate the lever.

10. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face-plate of a lathe, a gripping part adapted for engagement with the face of the work, a lever carrying the gripping part and having flanges formin a recess, an eccentric inserted within the anges, having a toothed face adapted for engagement with the work, a bolt extending through said flanges and eccentric, a bushing surrounding said bolt and extending within the bolt orifice in one of the flanges, a key engaging said bushing, bolt and eccentric, a nut on the bolt and a spring confined between the bushing and nut.

11. A driver for work centered between the centers of a lathe, comprising a support adapted for attachment to the face-plate of a lathe, a lever, pivoted to the support on an axis substantially perpendicular to the axis of rotation of the lathe and having a concave bearing face at one end, a block, having a toothed face, turnable Within the bearing face of the lever, and an eccentric, having a toothed face, pivoted to the other end of the lever.

In testimony of which invention, I have hereunto set my hand, at Philadelphia, on

this first day of April, 1907.

JOHN BURT.

Witnesses:

MARY I. BRADLEY, HELEN FAHNESTOOK. 

